Duncan zip code
Zip code in Duncan, IA
The location Duncan belongs to Hancock County, state of Iowa. Duncan has been assigned with the zip code 50423.
The location name Duncan is listed as unacceptable by the US Postal Service so any mailing should avoid it. Instead you can use Britt, the official name of the location.
| Zip code | Type | Population |
|---|---|---|
| 50423 | STANDARD | 2,450 |
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